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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d4c561b2cf633ccdb39ba4e614b212acf4416a2f45966483b76ab4920b5fb8' 
  AND token = 'tzG5+feNIbP/0bKpa4+Dp55+TDivhtei1AngYzPL/uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}